diff --git a/main.c b/main.c
index 6ef26d9..ae000fe 100644
--- a/main.c
+++ b/main.c
@@ -13,6 +13,7 @@
 int timer_start =  0xffff - (F_CPU / 1024 / 1000);
 volatile uint32_t ticks = 0;
 volatile bool counting = false;
+volatile bool beeping = false;
 
 void start_timer() {
     // Sets the Clock Select. See table on page 157 the Atmel datasheet.
@@ -39,6 +40,12 @@ void main() {
 ISR(TIMER1_OVF_vect) {
     TCNT1 = timer_start; // TODO figure out how to get the correct number
     if (counting) ticks += 1;
+
+    if (bit_is_set(PIND, PIND0)) {
+        PORTD &= 0b11111110;
+    } else if (beeping) {
+        PORTD |= 0b00000001;
+    }
 }
 
 void prog_7segment() {
@@ -67,19 +74,28 @@ void prog_7segment() {
     }
 }
 
+void beep() {
+    beeping = true;
+    _delay_ms(50);
+    beeping = false;
+}
+
 void prog_7segment_4digit() {
     DDRF  = 0b11111111;
     DDRK  = 0b00001111;
+    DDRD  = 0b00000001;
     PORTK = 0b11000000; // set pull-up
 
     float num = 0.0f;
     bool pressed_pause = false;
+    bool pressed_clear = false;
 
     while(1) {
         show_float(ticks / 1000.0f);
         float sleep_time = update_display();
 
         if (!pressed_pause && bit_is_clear(PINK, PINK7)) {
+            beep();
             counting = !counting;
             pressed_pause = true;
         } else if (pressed_pause && bit_is_set(PINK, PINK7)) {
@@ -87,8 +103,10 @@ void prog_7segment_4digit() {
         }
 
         if (bit_is_clear(PINK, PINK6)) {
+            if (!pressed_clear) beep(50);
             ticks = 0;
             counting = false;
-        }
+            pressed_clear = true;
+        } else pressed_clear = false;
     }
 }
diff --git a/pinout.png b/pinout.png
new file mode 100644
index 0000000..0c652af
Binary files /dev/null and b/pinout.png differ